/*
 * Copyright (C) 2012 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.config;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * annotation for use with set<FIELD>() methods to indicate how to get a value from JSON to populate
 * the field via the set method
 */
@Retention(RetentionPolicy.RUNTIME)
public @interface FieldExtractor {
  public String key();

  public Class<?> extractorClass();

  public boolean optional() default false;
}
